| 摘要 |
<p>Problem: To place a muffler in a front area to make it suitable for an offroad motorcycle. Solution: A down frame 5 extending downward obliquely from a head pipe 2 ahead of an engine 7 and a lower frame 6 connected with its lower end, extending backward under the engine 7, are provided. A muffler 21 is located in the vicinity of the joint between the down frame 5 and the lower frame 6 where its rear surface is curved forward in a convex pattern along the down frame 5 and the lower frame 6. An exhaust pipe 20 extending from a cylinder head 11 is almost S-shaped as seen sideways and its forward curved portion 40 and lower backward curved portion 41 are vertically arranged with its lower end connected with a lower portion of the muffler 21.</p> |
